CN2754099Y - Oxygen sensor - Google Patents
Oxygen sensor Download PDFInfo
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- CN2754099Y CN2754099Y CN 200420105465 CN200420105465U CN2754099Y CN 2754099 Y CN2754099 Y CN 2754099Y CN 200420105465 CN200420105465 CN 200420105465 CN 200420105465 U CN200420105465 U CN 200420105465U CN 2754099 Y CN2754099 Y CN 2754099Y
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- electrode
- lambda sensor
- sensitive element
- calandria
- sensing element
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Abstract
The utility model discloses an oxygen sensor, which comprises a sensing element, a heating body and a high-temperature electrode, wherein the sensing element has a sheet-shaped structure; the inner part of the heating body is provided with a cavity, and a small hole connected with the cavity is arranged on one surface of the heating body; one surface of the sensing element is in contact with environment atmosphere through the small hole, and the other surface is connected with automobile exhaust; the sensing element is integrated with the heating body; the high-temperature electrode is connected with electrodes at both sides of the sensing element for outputting the signals of the sensing element; the inner and the outer surfaces of the sheet-shaped sensing element are provided with a reference electrode and a measuring electrode, wherein the reference electrode is in contact with the environment atmosphere through the small hole and the measuring electrode is in contact with the automobile exhaust. The oxygen sensor has the advantages of low cost, high sensitivity, fast activation, low requirement of mechanical strength to the main body of the oxygen sensor and long service life.
Description
[technical field]
The utility model relates to a kind of lambda sensor, relates in particular to a kind of automobile-used chemically correct fuel lambda sensor.
[background technology]
In engine control system, lambda sensor, three-element catalytic and Electronic Control oil supply system are a cover, promptly so-called three-part system, and this system is the core of modern engine control.Using maximum oxygen sensor used in vehicle now is etection theory air-fuel ratio type lambda sensor, and it is used for the electric spray control system of engine, makes it remain near the work of chemically correct fuel, thereby makes three-element catalytic be in best operation interval.
Present widely used lambda sensor is a concentration difference type Zirconium oxide oxygen sensor, mainly adopts tubular structure, and this lambda sensor inside is formed by structures that element is organized such as ceramic sensing head, electrode pads, compression spring and signal conductors.Wherein, ceramic sensing head can adopt cold isostactic pressing or ejection formation dual mode to make.But there is following shortcoming: make with cold isostactic pressing, machinery and equipment cost costliness, shaping speed is slow, the maintenance of die cost and attached peripheral equipment be difficult for and cost high, and the goods that mold can produce burr, the secondary processing program of the many one car burr of need on the product technology.And with ejection formation, it makes ceramic sensing head cost height, and need in zirconia, to add many organic additives to increase its associativity, so when ceramic sensing head carries out high temperature sintering again after moulding, can and produce shrinkage phenomenon because of the residual big space of its organic compound combustion, make ceramic sensing head global tissue density deficiency, will dislike not enough slightly with respect to the overall construction intensity of institute's moulding, serious even can produce crack performance, made to go out the good rate of quality low.So the manufacturing of ceramic sensing head is can't produce in a large number at present, and causing production unit cost high, also is the technical bottleneck on the present industry.
Chinese patent application CN00120637.0 discloses a kind of tubulose lambda sensor and manufacture method thereof.One end opening of lambda sensor, the surfaces externally and internally of the tubular ceramic oxygen sensitive element of end sealing has the porous contrast electrode and the potential electrode of band conductive connecting line.Be disposed with zirconia porous protective layer and aluminum oxide porous protective seam on the pole-face of potential electrode.On sensitivity and rate of activation, obtained bigger progress.But, along with the raising of people, recognizing automotive emissions to atmospheric brokenization to environmental consciousness, people have higher requirement to cost, sensitivity and the rate of activation of lambda sensor.
[utility model content]
Technical problem to be solved in the utility model provides the lambda sensor that a kind of cost is low, highly sensitive, activation is fast.
The technical matters that the utility model further will solve provides a kind of lambda sensor, and it is low to lambda sensor main body requirement of mechanical strength.
The technical matters that the utility model further will solve provides a kind of lambda sensor of long working life.
In order to solve above technical matters, the technical solution of the utility model is:
A kind of lambda sensor, comprise sensitive element, also comprise calandria and high temperature electrode, sensitive element is a schistose texture, calandria inside is provided with cavity and is provided with the aperture that links to each other with cavity in surface thereof, the sensitive element one side contacts with ambient atmosphere by aperture, and another side links to each other with vehicle exhaust, and sensitive element and calandria are structure as a whole; High temperature electrode links to each other with two lateral electrodes of sensitive element, in order to the signal of output sensitive element.
The upper surface area of sensitive element is less than the upper surface area of calandria.
The upper surface of described sheet sensitive element is circular, oval or square.
The thickness of described round sheet sensitive element is less than 1 millimeter, and diameter is 8.5 millimeters.
The surfaces externally and internally of described sheet sensitive element has contrast electrode and potential electrode, and contrast electrode contacts with ambient atmosphere by aperture, and potential electrode contacts with vehicle exhaust.
The thickness of described potential electrode is the 5-25 micron, and porosity is 40-60%; The thickness of contrast electrode is the 5-50 micron, and porosity is 30-60%.
Described potential electrode and reference electrode are porous metals electrode or oxide electrode.
A side that is printed on high temperature electrode at calandria is provided with protective seam or is coated with insulating trip.
Described calandria is a schistose texture.
The upper surface of described sheet calandria is square, platform shape or taper.
The surface of described potential electrode is provided with protective seam.
Technique effect of the present utility model is:
(1) the lambda sensor cost is low, highly sensitive, activation is fast.Its principle is such, the utility model lambda sensor is a chip oxygen sensor, with alumina ceramic substrate printed resistor slurry, lamination, the flaky pottery calandria that the high temperature co-firing preparation has the internal cavity structure, prepare sensitive element with die pressing or The tape casting, thereby it is with low cost, the homogeneity of product height, assembling is simple, and sensitive element and calandria are by the high-temperature sealing material structure that is connected as a single entity, and the heat of calandria is directly transferred on the sensitive element, thermal efficiency height, especially under the condition of high temperature, just can add heat sensor with half power consumption of old-fashioned tubular sensor.In addition, the thickness of sensitive element is less than 1 millimeter, and diameter is 8.5 millimeters, little, the thin thickness of quality with respect to the zirconia ceramics pipe, and promptly the total volume of lambda sensor is less, can shorten behind the engine start to the stand-by period that lambda sensor activates.Fig. 3 is the relativity figure of the utility model lambda sensor and tubular type lambda sensor intensification activationary time, and also as can be seen, the stand-by period that lambda sensor activates is obviously short than tubular type lambda sensor from figure.
(2) requirement of mechanical strength to the lambda sensor main body is low.So little, the thin thickness of the area of sensitive element is low to the requirement of mechanical strength of main body.
(3) long working life.Lambda sensor is provided with protective seam or is coated with insulating trip in the side that calandria is printed on high temperature electrode; this protective seam and insulating trip cover the side that calandria is printed on high temperature electrode; the energy guard electrode is avoided the impact of high temperature and high speed air-flow; prolonged the serviceable life of high temperature electrode; also play simultaneously the insulating property of guard signal output electrode and Metal Packaging body; and also be provided with ceramic protective layer on the potential electrode surface, also prolonged the serviceable life of lambda sensor.
[description of drawings]
In conjunction with example the utility model is described in further detail with reference to the accompanying drawings:
The structural representation of Fig. 1 the utility model lambda sensor;
Fig. 2 sensitive element structural representation;
The relativity figure of Fig. 3 the utility model lambda sensor and tubular type lambda sensor intensification activationary time.
[embodiment]
Fig. 1 is the structural representation of the utility model lambda sensor.This lambda sensor is made up of sensitive element 1, calandria 2, insulating trip 3 and high temperature electrode 4.Calandria 2 inside are provided with cavity and are provided with the aperture 5 that links to each other with cavity in the one side, sensitive element 1 one side contacts with aperture 5 on the calandria 2 by aperture, be used for linking to each other with atmospheric environment, another side contacts with vehicle exhaust, be used to gather the parameter of ambient atmosphere and vehicle exhaust, seam that sensitive element 1 and calandria are 2 adopt thermal expansivity and with high-temperature material sealing that sensitive element 1 and calandria 2 materials the are complementary structure that is connected as a single entity, can use the devitrified glass sealing; High temperature electrode 4 is two, links to each other with two lateral electrodes of sensitive element 1 respectively, and in order to the signal of output sensitive element, insulating trip 3 covers the side that ceramic heating body 2 is printed on high temperature electrode 4.
Fig. 2 is the utility model sensitive element structural representation.Sensitive element 1 for schistose texture and within it outside surface contrast electrode 7 and potential electrode 6 are arranged; the contrast electrode 7 of sensitive element 1 contacts with aperture 5 on the calandria 2; be used for linking to each other with atmospheric environment; potential electrode 6 contacts with vehicle exhaust; because this lateral electrode long-term work is in high temperature and high speed tail gas environment; in order to prolong its serviceable life, the porous ceramics protective finish is arranged in potential electrode 6 surface preparation.
In a preferred embodiment of the present utility model, sensitive element 1 is the circular sensitive element of cobalt oxide, and its diameter is 8.5 millimeters, and thickness is less than 1 millimeter; Surfaces externally and internally at the circular sensitive element of cobalt oxide is provided with contrast electrode 7 and potential electrode 6, and wherein the thickness of potential electrode 6 is the 5-25 micron, and porosity is 40-60%; The thickness of contrast electrode 7 is the 5-50 micron, and porosity is 30-60%, and contrast electrode 7 and potential electrode 6 are porous platinum electrode, and are provided with ceramic protective layer on potential electrode 6 surfaces, and material is ZrO
2-CaO-MgO-Al
2O
3Calandria 2 is a ceramic heating body; Insulating trip 3 is the aluminium oxide ceramics pad.
In another preferred embodiment of the utility model lambda sensor, contrast electrode 7 and potential electrode 6 are the porous metal oxide electrode.
In the 3rd preferred embodiment of the present utility model, adopt the porous ceramics coating to cover the side that ceramic heating body 2 is printed on high temperature electrode 4, also play the insulating property of guard signal output electrode and Metal Packaging body simultaneously.
The concrete preparation method of lambda sensor is as follows:
Certainly lambda sensor can also be made with the following method: chip ceramic heating body 2 preparations of band cavity structure are the same; prepare the yttrium stable zirconium oxide ceramic substrate with The tape casting; the thickness of substrate is 25～50 microns; method by serigraphy is printed porous platinum electrode in stable zirconium oxide substrate one side of yttrium; toast; baking temperature is 100～200 ℃; time is 15～120 minutes; then at opposite side printing porous platinum electrode, same condition is toasted, and toasts the laggard column electrode sintering that finishes; sintering temperature is 500～1000 ℃; time is 15～120 minutes, prints the porous ceramics protective seam then on the electrode of a side, and material is ZrO
2-CaO-MgO-Al
2O
3Baking temperature is 100～200 ℃, time is 15～120 minutes, carry out high temperature sintering then, sintering temperature is 1000～1200 ℃, sintering time is 120 minutes, by cut or electric arc cutting the zirconia ceramics substrate of full wafer is divided into the zirconia sensitive element 1 of required form and size at last, zirconia sensitive element 1 is the square of length of side 5mm in this lambda sensor manufacture method, zirconia sensitive element 1 is mounted on the ceramic heating body 2 of band cavity structure by the platinum electrode slurry, the aperture 5 of the center of zirconia sensitive element 1 on the ceramic heating body 2, contrast electrode 7 is conducted with a high temperature electrode by the platinum slurry that mounts usefulness, starch potential electrode 6 and another high temperature electrode conducting with platinum, with high-temperature sealing material the seam of zirconia sensitive element 1 with ceramic heating body 2 sealed all around at last, infiltrate in the reference gas to prevent tail gas.
The relativity figure of Fig. 3 the utility model lambda sensor and tubular type lambda sensor intensification activationary time.Curve 1 is the relation curve of chip oxygen sensor intensification and activationary time among the figure, and it is near transverse axis, and curve 2 is for the relation curve of tubular type lambda sensor intensification with activationary time, away from transverse axis.This figure result is obtained by engine rig test, and wherein, delivery temperature is 350 ℃, λ=0.97.As can be seen from the figure, the stand-by period of lambda sensor activation is obviously short than tubular type lambda sensor.Zirconia sensitive element size is little, the thin thickness of quality with respect to the zirconia ceramics pipe, so the intensification activationary time is short, and it is low to the requirement of mechanical strength of lambda sensor main body, the power of lambda sensor operate as normal consumption simultaneously is also little, the ceramic heating body cold-state resistance of the lambda sensor of tubular structure is 2.1 Ω, and the cold-state resistance of the used ceramic heating body of slice structure lambda sensor is 4 Ω.
Characteristics of the present utility model are that the heat of heater is directly transferred to sensitivity by calandria 2 On the element 1, so the thermal efficiency is very high. Especially under the condition of high temperature, with old-fashioned tubular sensor half Power consumption just can add heat-sensitive element. In addition, because the total capacity of lambda sensor is smaller, So can shorten behind the engine start to the stand-by period that lambda sensor activates. Certain sensing element 1 Can also take ellipse, square structure or other suitable shapes. Such conversion all drops on this reality Within novel protection domain.
Claims (11)
1. lambda sensor, comprise sensitive element (1), it is characterized in that: also comprise calandria (2) and high temperature electrode (4), sensitive element (1) is a schistose texture, calandria (2) inside is provided with cavity and is provided with the aperture (5) that links to each other with cavity in surface thereof, this sensitive element (1) one side contacts with ambient atmosphere by aperture (5), and another side links to each other with vehicle exhaust, and sensitive element (1) is structure as a whole with calandria (2); High temperature electrode (4) links to each other with two lateral electrodes of sensitive element (1).
2. according to the described lambda sensor of claim 1, it is characterized in that: the upper surface area of described sheet sensitive element (1) is less than the upper surface area of calandria (2).
3. according to the described lambda sensor of claim 2, it is characterized in that: the upper surface of described sheet sensitive element (1) is for circular, oval or square.
4. according to the described lambda sensor of claim 3, it is characterized in that: the thickness of described round sheet sensitive element (1) is less than 1 millimeter, and diameter is 8.5 millimeters.
5. according to each described lambda sensor in the claim 1 to 4, it is characterized in that: the surfaces externally and internally at described sheet sensitive element (1) is provided with potential electrode (6) and contrast electrode (7), contrast electrode (7) contacts with ambient atmosphere by aperture (5), and potential electrode (6) contacts with vehicle exhaust.
6. according to the described lambda sensor of claim 5, it is characterized in that: described potential electrode (6) and contrast electrode (7) are porous metals electrode or oxide electrode.
7. according to the described lambda sensor of claim 6, it is characterized in that: the thickness of described potential electrode (6) is the 5-25 micron, and porosity is 40-60%; The thickness of described contrast electrode (7) is the 5-50 micron, and porosity is 30-60%.
8. according to the described lambda sensor of claim 5, it is characterized in that: the surface of described potential electrode (6) is provided with protective seam (8).
9. according to each described lambda sensor in the claim 1 to 4, it is characterized in that: described calandria (2) is schistose texture.
10. according to the described lambda sensor of claim 9, it is characterized in that: the upper surface of described sheet calandria (2) is square, platform shape or taper.
11. according to each described lambda sensor in the claim 1 to 4, it is characterized in that: a side that is printed on high temperature electrode (4) at calandria (2) is provided with protective seam or is coated with insulating trip (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420105465 CN2754099Y (en) | 2004-12-01 | 2004-12-01 | Oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420105465 CN2754099Y (en) | 2004-12-01 | 2004-12-01 | Oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2754099Y true CN2754099Y (en) | 2006-01-25 |
Family
ID=35926207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420105465 Expired - Lifetime CN2754099Y (en) | 2004-12-01 | 2004-12-01 | Oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2754099Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995426A (en) * | 2009-08-14 | 2011-03-30 | 比亚迪股份有限公司 | Chip type oxygen sensor and preparation method thereof |
| CN108369203A (en) * | 2015-12-17 | 2018-08-03 | 株式会社电装 | Sensor element electrode and sensor element |
| CN112611788A (en) * | 2020-12-28 | 2021-04-06 | 山东大学 | Semiconductor hydrogen sulfide gas sensor |
-
2004
- 2004-12-01 CN CN 200420105465 patent/CN2754099Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995426A (en) * | 2009-08-14 | 2011-03-30 | 比亚迪股份有限公司 | Chip type oxygen sensor and preparation method thereof |
| CN108369203A (en) * | 2015-12-17 | 2018-08-03 | 株式会社电装 | Sensor element electrode and sensor element |
| CN108369203B (en) * | 2015-12-17 | 2020-10-16 | 株式会社电装 | Sensor element |
| CN112611788A (en) * | 2020-12-28 | 2021-04-06 | 山东大学 | Semiconductor hydrogen sulfide gas sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20141201 Granted publication date: 20060125 |